Fixed #16334 - Changed composer order in upgrade script

[snipe]

This should fix #16334, where the backup would fail since the new dependences have not yet been installed.

[what-the-diff]

PR Summary

• Introduces Pre-Migration Backup
  The update adds a significant new step to ensure a backup is created before the process of data transfer begins. This change will serve to protect valuable data during migration, providing an additional safety net.

• Rationalizes Upgrade Process
  Renumbering of steps within the script reflects a more logical order of operations. By executing the 'Backing up database' operation as part of step 8 and relegating 'Putting application into maintenance mode' to step 7, we've maximized operational efficiency.

• Eliminates Redundancies
  To minimize confusion, the revised script removes echo commands that were previously duplicated. These pertained to operations for backing up the database and transitioning the application into maintenance mode. The improvements will enhance readability and comprehension for users.

[snipe]

"By executing the 'Backing up database' operation as part of step 8 and relegating 'Putting application into maintenance mode' to step 7, we've maximized operational efficiency."

lol oh AI...

[uberbrady]

Looks great! I think I was getting 'stuck' on the "backup-before-pull" concept, but the backup doesn't backup vendors or the actual application code itself; just the data - so we really don't need to do it in that order. Thank you!